Chorological structure of Rosaceae Juss. family is presented in the study of the flora of Khakassia, reflecting the main regularities of distribution of species of plants on types and subtypes of areas. As a whole 12 geoelements are allocated. The analysis of chorological structure testifies to the connection of flora of the studied territory with the flora of Europe, America and other continents and also with the flora of different regions of Asia that promote the detection of regularities of florogene-sis. In Rosaceae family in the territory of Khakassia Asian types - 43 (43.43 %) having approximately equal, quite weak connection with the flora: North-ern Asia - 11 types (11.11 %); Central - 9 types (9.09 %), MIddle - 6 types (6.06 %), Eastern Asia - 3 varieties (3.03 %) and Mongolia - 5 types (5.05 %) prevail. Southern Siberia is presented by 3 types (3.03 %), endemic of the Altai-Sayansk prov-ince - 6 (6.06 %) that points to some autochthonic processes in formation of family. The types which distribution is limited to the Eurazian continent - 34 are considerably presented (34.34 %). Much more concede them views with the golarktic - 17 types (17.17 %), cosmopolitan - 3 varieties (3.03 %) and Asian-American - 2 varie-ties (2.02 %) types of areas. The endemizm of types of family small is 6 types of gemiendem (6.06 %). The representatives of Rosaceae family play a significant role in the addition of steppe communities of Khakassia. The activity of types of family decreases in the process of xerophytization of conditions of habitat: in meadow steppes of the Aconito Barbati-Poion transbaicalicae union activity 89.52 (19.42 %), thus it the greatest at actually Eurasian (31.40), Eurosiberian (25.90) and golark-tic (17.67) types; in the real steppes of the Festuco Valesiacae-Caricion pediformis union activity of types of family is much lower - 41.01 (11.27 %), in these communities are more active actually Eura-sian (16,19) and North Asian (10.25) types; petro-phytic steppes of the Eritrichio pectinati-Selaginellion sanguinolentae union on the activity of types of Rosaceae family come nearer to com-munities of the real steppes - 40.58 (11.00 %), here types with North Asian (13.14) and Central Asian (9.61) areas are undoubtedly leading.
Rosaceae Juss, Khakassia, types and subtypes of areas, activity of varieties
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